Key parameters at a glance

A radius of 1.96 Earth radii
A mass of 4.50 Earth masses
Surface gravity around 1.17 g
An orbital period of 2.860 days
Semi-major axis 0.0409 AU
Equilibrium temperature 1,529 K (1256 °C)
Distance from Earth 1,763.76 light-years
Earth Similarity Index 0.169
Travel time at Voyager 1 speed 31,103,969 years

K2-230 b Planet Profile

Physical Specs

Radius

1.96 R⊕

Radius (Jupiter)

0.175 R♃

Mass

4.50 M⊕

Mass (Jupiter)

0.014 M♃

Density

3.28 g/cm³

Surface Gravity

1.17 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.169

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#49of 1176

top 4.1%

This planet

1.96R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-174 b 1.96 R⊕ Kepler-792 b 1.96 R⊕ Kepler-118 b 1.96 R⊕

Metric	Earth	K2-230 b	Jupiter
Radius (R⊕)	1.00	1.96	11.21
Mass (M⊕)	1.00	4.50	317.83
Density (g/cm³)	5.51	3.28	1.33
Surface Gravity (g)	1.00	1.17	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 288527728

Gaia DR2

Gaia DR2 3676684252407983488

Gaia DR3

Gaia DR3 3676684252407983488

System

K2-230

Percentile among Super-Earth cohort

Radius 1.960 R⊕ · percentile 95 / cohort 1176

Mass 4.500 M⊕ · percentile 86 / cohort 1176

Orbital period 2.86 d · percentile 20 / cohort 1164

Distance 540.77 pc · percentile 49 / cohort 1171

ESI 0.169 · percentile 7 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

2.860 days

Semi-major axis

0.0409 AU

Eccentricity

—

Inclination

85.99 °

Year Length

A year here lasts approximately 2.86 Earth days (0.8% of a terrestrial year) at a mean orbital distance of 0.0409 AU.

Transit Fingerprint

Depth

0.020 %

Duration

2.600 h

Impact parameter b

0.390

Rp / R★

0.012900

Transit midpoint (BJD)

2,457,582.5918

Photometric dip

Transit produces a flux drop of 200 ppm lasting ≈ 2.60 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012900

Semi-major axis / stellar radius

7.300

Impact parameter (b)

0.390

Transit mid-time (BJD)

2,457,582.5918

Angular separation (arcsec)

0.07560

Eq. Temperature

1,529K

(1256 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.169

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Mayo et al. 2018

Instrument

Kepler CCD Array

Publication

2018-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at K2 (12 shown).

K2-190 c · Rocky Terrestrial K2-183 b · Rocky Terrestrial K2-209 b · Rocky Terrestrial K2-210 b · Rocky Terrestrial K2-165 b · Super-Earth K2-169 b · Super-Earth K2-148 b · Super-Earth K2-219 b · Super-Earth K2-190 b · Super-Earth K2-200 b · Super-Earth K2-201 b · Super-Earth K2-170 b · Super-Earth

Host System: K2-230

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,945 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.390 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.647 g/cm³

Systemic radial velocity

-20.61 km/s

Rotational v·sin i

5.20 km/s

Metallicity ratio

[Fe/H]

Distance

540.77 parsec

Light-years 1,763.76 ly

V-band magnitude

12.79 mag

Voyager-speed travel 31,103,969 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.821 mas

Total Proper Motion

24.807 mas/yr

PM Right Ascension

-20.56 mas/yr

PM Declination

13.88 mas/yr

Galactic Cartesian (pc)

x = -0.974 · y = -0.196 · z = -0.115

Equatorial (J2000)

RA 191.36312° · Dec -6.57605°

Galactic ℓ, b

300.255° · 56.265°

Ecliptic λ, β

193.012° · -1.559°

HTM-20 index

1294925171